نتایج جستجو برای: arid region in north

تعداد نتایج: 17040270  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی 1390

abstract u.s. attack to afghanistan after 9/11 provided opportunities for us who tried to become the dominant power after collapse of ussr and bipolar world. thinkers like fukuyama believed american liberal democrats thought would be universally accepted without resistances. liberal democracy is the best and final model of governance; in this regard, united state has moral responsibilities for...

Journal: :The American naturalist 2009
Margaret E K Evans Stephen A Smith Rachel S Flynn Michael J Donoghue

We integrate climatic niche models and dated phylogenies to characterize the evolution of climatic niches in Oenothera sections Anogra and Kleinia (Onagraceae), and from that we make inferences on diversification in relation to climate. The evolution of climatic tolerances in Anogra + Kleinia has been heterogeneous, across phylogenetic groups and across different dimensions of climate. All the ...

2007
Umar Isa Ibrahim Albert Wulari Mbaya Hayatu Mahmud Ali Mohammed

The prevalence of cryptosporidial infection among captive wild animals and birds in Sanda Kyarimi Park, Maiduguri, north-eastern Nigeria, was evaluated by faecal examination for oocysts using three different staining techniques: the modified Ziehl-Neelsen, Giemsa, and Safranin-methylene blue. A total of 66 captive wild animals and birds were examined based on age and sex differences. Fifteen (2...

Journal: :Journal of Arid Land 2022

Glaciers are highly sensitive to climate change and undergoing significant changes in mid-latitudes. In this study, we analyzed the spatiotemporal of typical glaciers their responses period 1990–2015 4 different mountainous sub-regions Xinjiang Uygur Autonomous Region Northwest China: Bogda Peak Karlik Mountain Tianshan Mountains; Yinsugaiti Glacier sub-region Karakorum Youyi Altay Mountains. T...

Journal: :تحقیقات جغرافیایی 0
سمیه خالقی دهنوی دانشگاه اصفهان ناهید آتشی داریوش رحیمی ناهید آتشی دانشگاه اصفهان

single storms are the most restore water at the water management especially in arid and semi arid. therefore, single storm estimation is the important step in risk management. this study, single storm estimated by gsdm model. so, the date used include: meteorological data, dem and water value in basin jahanbin. in the gsdm model should divide basin to two region smooth and rough, moisture adjus...

2005
Richard M. Cowling Derek R. du Preez

The winter-rainfall region of southern Africa, covered largely by the fynbos and succulent karoo biomes, harbours the world’s greatest concentration of geophyte species. Species diversity is greatest in the south-west, where more than 500 species co-occur in one quarter-degree square; in the south-east the values are generally around 100, and in the arid north-west, always less than 50 (more of...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید چمران اهواز - دانشکده مهندسی علوم آب 1393

drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...

2009
Mathias Vuille Stephen J. Burns Hai Cheng Lawrence Edwards Ivo Karmann Augusto S. Auler Hanh Nguyen

precipitation changes in the region on orbital timescales. 22 The Nordeste, a semi-arid region in northeastern Brazil, 23 is known for its severe and recurrent droughts, which cause 24 socioeconomic problems for millions of people. Observational and 25 modelling studies have convincingly linked below-normal rainfall 26 in the Nordeste during the rainy season (February, March and 27 April) to pe...

The development of agriculture and industry and the increase of population in countries with arid to semi-arid climates have led to more harvesting of groundwater resources and as a result land subsidence in different parts of the worlds. Decades of groundwater overexploitation in the Kashmar-Bardaskan plain in the north-east of Iran has resulted substantial land subsidence in this plain. The p...

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